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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1890cf193ef6cebec413f216c24b8cddcad5ca74538a328c8e434d3ad72acde4' 
  AND token = '2HIOzTM0P6G1ny0NhJ3ZEDnjrKGaVIApIUHzFWUsYDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}